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| DOI： |
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| Effects of Different Farmland Managements on Carbon Balance in Coastal Saline Soils |
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MI Yingbin, YANG Jingsong, YAO Rongjiang, YU Shipeng
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State Key Laboratory of Soil and Sustainable Agriculture /Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China)
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| Abstract: |
| To inquire into the effects of different management treatments on carbon balance of the coastal saline soils, field maize-wheat rotation experiments were conducted to study C balance in different management treatments.There were 6 treatments which were ① conventional tillage (CK); ② application of organic fertilizer (OF); ③application of nitrogen fertilizer (NF); ④ application of straw (S); ⑤ application of organic fertilizer and straw (OF + S); ⑥ no tillage (NT). It turned out that treatments of S and OF increased the emission of soil CO2, and the average CO2 efflux of NT released a quantity to a minimum, the average rate of CO2 emission in different treatments showed as follows: OF+S>S>OM>NF>CK>NT. After crops harvested, soil organic carbon content increased in each measure, the largest were OF and NT measures, NF did not significantly raise the content of soil organic carbon. After the experiment, carbon input were higher than carbon output in each measure, were all the net carbon input, it showed the strong characteristic of carbon sink. The C net inputs of S and OF measures were significantly higher than CK, these would effectively slow down the global climate change caused by the farmland soil CO2 emissions. |
| Key words: CO2 emission; soil C pool; carbon balance |
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